Abstract
In order to study the strength of the connection between a propagating carbenium ion and its counterion, the cationic polymerization of styrene was performed in the presence of two kinds of catalysts (SnCl4 and AcClO4) or of a catalyst and a salt (e.g., SnCl4 and n-Bu4NClO4), and the molecular-weight distribution of the polymer obtained was examined. The molecular-weight distributions of the polystyrene obtained in methylene chloride or in a mixture of methylene chloride and benzene consisted of more than one peak. This suggests that two propagating ends whose counterions are different coexist by the simultaneous use of two catalysts and produce polymers independently without interchanging their counterions. “Two-counterion polymerization” will be defined as the polymerization in which one kind of monomer propagates through two propagating ends with different counterions.
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Higashimura, T., Masuda, T. Molecular Weight Distribution of Polystyrene Formed in Cationic “Two-Counterion” Systems. Polym J 5, 278–282 (1974). https://doi.org/10.1295/polymj.5.278
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DOI: https://doi.org/10.1295/polymj.5.278